scala async/await on android

Test.scala

package com.cc.json2csv

import android.app.Activity
import android.os.Bundle
import play.api.libs.json._
import android.widget.TextView
import android.util.Log
import scala.async.Async.{async, await}
import scala.concurrent.{Await, Future, ExecutionContext, future}
import scala.concurrent.duration._
import ExecutionContext.Implicits.global

/**
 * @author Wes Lanning
 * @version 2013-07-06
 */
class Test extends Activity
{
    override def onCreate(savedInstanceState: Bundle)
    {
        super.onCreate(savedInstanceState)

        def parseJson(lines: String): Future[JsValue] = future {
            Json.parse(lines)
        }
        
        // define an async function
        def jsonResult:Future[String] = async {
            val source = scala.io.Source.fromFile("/sdcard/example.json")
            val lines = source.mkString
            source.close()
            // stop here and wait for the result from above if it's not done yet
            val json = await(parseJson(lines))
            Json.stringify(json)
        }
        // get our json result using the async functions above
        val json: String = Await.result(jsonResult, 10.seconds)
        setContentView(R.layout.main)
        val textView = findViewById(R.id.test).asInstanceOf[TextView]
        textView.setText(json)
        Log.d("Test", "json result: " + jsonResult.value)
    }
}